shlwapi: Test and fix the behaviour of the CopyTo method for file sizes not multiple of the internal buffer size, on SHCreateStreamOnFileEx-returned IStreams. (try 5)

[David Quintana (gigaherz)]

Improved the filename decision, as Alexandre suggested.

---
 dlls/shlwapi/istream.c       | 14 ++++----
 dlls/shlwapi/tests/istream.c | 84 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+), 7 deletions(-)
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